10 kW向心透平内二次流形成机理与损失分析

In order to effectively improve and enhance the efficiency and performance of the radial flow turbine with organic working medium, the thermodynamic design and simulation calculation of the 10 kW radial flow turbine were carried out, the formation mechanism and manifestation of various vortex systems in the static cascade and the rotor impeller were analyzed, and the distribution of static pressure utilization coefficient in different sections of the static cascade and the total pressure distribution in the internal section of the rotor blade were given. Results show that there is a transverse flow from the pressure surface to the suction surface in the stator blade, horseshoe vortex and wake vortex exist in the leading edge and trailing edge respectively, but the passage vortex is not captured, and the pressure branch of horseshoe vortex reaches the suction surface at 1/2 chord length. The vortex system in the rotor blade is mainly composed of leading edge pressure vortex, passage vortex and leakage vortex. The vortex formed on the hub surface at the pressure side of the leading edge of the rotor intersects with the passage vortex developed at the end, which intensifies the flow loss here. The flow condition at the high section of 0.6-fold rotation cotyledons is the best. Due to the mutual mixing of leakage vortex and passage vortex at the rotor tip, the streamline distribution at the section near the blade tip is complicated.